She also said that they understand that XRP shouldn´t be volatile before banks start use it. But what does it mean? And how they achieve it? If they manipulate the price to make it stable, then all XRP investors wouldn´t be pleased. 
If they want XRP to be a non volatile coin and then it must be backed by something that can make it stable and that will also make ripple became a competitor for the stable coin too. They can't do that as XRP is not backed by any commodity or fiat money to make its price become stable.